Method of purifying caprolactam
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United States of America Patent
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-
Aug 19, 1986
Grant Date -
N/A
app pub date -
Feb 7, 1985
filing date -
Feb 8, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention is concerned with a method of purifying caprolactam as obtained by Beckmann transposition or by nitrosation of cyclohexyl compounds, characterized in that it comprises the following steps: (a) the caprolactam oil is treated with ammonia to obtain a pH in the 8 to 10 range; (b) the caprolactam in water-ammonia solution yielded by (a) is extracted with toluene; (c.sub.1) any caprolactam still in the toluene solution yielded by (b) is treated with NaOH; (C.sub.2) the aqueous phase left over from the extraction with toluene (b) is removed.
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